Battery monomer, negative electrode active material, preparation method of negative electrode active material and battery device

By coating the graphite core with a metal element coating layer and fixing the metal element with chemical bonds, the problem of insufficient lithium-ion transport in the negative electrode active material at low temperature is solved, and higher lithium-ion transport capacity and battery cell charging capacity are achieved.

CN122158499APending Publication Date: 2026-06-05CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411771247.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing negative electrode active materials have insufficient lithium-ion transport capacity at low temperatures, leading to increased interfacial impedance and reduced charging capacity of individual battery cells.

Method used

A coating layer containing metal elements is applied to the surface of the graphite core. The metal elements are fixed by chemical bonds, which increases the active sites of lithium ions and reduces the possibility of metal precipitation. The metal elements are grafted onto the surface of the graphite core and the coating layer in the form of carbon-oxygen bonds and carbon-metal bonds.

Benefits of technology

The interfacial impedance of graphite materials is reduced, which improves the lithium-ion transport capability, reduces the charge transfer impedance of individual battery cells, and enhances the charging capability of individual battery cells.

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Abstract

The invention discloses a battery monomer, a negative electrode active material, a preparation method of the negative electrode active material and a battery device. The battery monomer comprises a negative pole piece and a positive pole piece, and the negative pole piece comprises a negative current collector and a negative film layer which is arranged on at least one surface of the negative current collector and comprises a negative active material; the negative electrode active material comprises a graphite inner core and a coating layer at least partially covering the surface of the graphite inner core; the coating layer comprises one or more of a carbon element and a metal element; wherein the carbon element comprises amorphous carbon, and the metal element is grafted on the surface of the graphite core and / or in the coating layer through chemical bonds. According to the embodiment of the invention, the interface impedance of the negative electrode active material can be reduced, the charge transfer impedance of the battery monomer is reduced, and the charging capability of the battery monomer is improved.
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